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Voltage bump... how much?

T

That Linux Guy

Limp Gawd
Joined
Aug 24, 2008
Messages
306
I've looked around and I can't find an answer to my question. I just tried OCing my rig (E8400, OCZ Reaper HPC 800MHz, DFI Lan Party DK P35 T2RS), and I got stuck at 400fsb. The CPU seems stable at 3.6GHz, and the RAM is happy running 960 MHz at 2.1v. I'm not an experience OCer, so I've kept playing around with various BIOS settings to a minimum. I've disabled C1E and EIST, and I've got the FSB to 400 on stock volts.

I'm thinking I just need a voltage bump to get to 4GHz (my goal), but I'm not sure how much. Is it .01v? .001? .1? What about the northbridge? How much extra voltage for that?

Am I doing this wrong? Is there something else I should've done? or a different way to go about it? Any help would be very much appreciated.
 
id say go up .100v depending on what your current voltage is at.. if you have already reached 1.4v which i doubt then id go .05 up.. if its stable going up .100v then slowly drop the voltage til its unstable.. then go back up in .01v steps til its stable again.. then you found your lowest voltage that is stable at that overclock.. its all trial and error.. as long as your under 1.45v your not going to hurt the processor messing with voltages..
 
First of all, don't go any higher than 1.4V. As for adjusting it, try going in increments of 0.0125V or 0.025V. If it's unstable, go up another notch. C2Ds are pretty sensitive to voltage adjustments, so you might find that even a tiny bump is enough to make you stable at 4GHz, depending on your CPU revision.
 
Thank you SirMonkey and Zero for your responses.

I immediately ran into some confusion once I was in the BIOS. There are two similar sounding options in DFI's Genie BIOS. There's the CPU VID Special Add and the CPU VTT Voltage. My system seemed working just fine at stock voltage at 400fsb, but it would fail Orthos in 4 seconds. After raising the CPU VTT voltage, I still got the same result. The CPU VID Special Add option gives me exponential increments of 12.5mV. I raised this up two increments. I can't remember what the second number was, but my current voltage is 1.216 according to CPUz. When the CPU VID Special Add was only raised one increment, Orthos failed after 36 seconds. I guess I don't have a golden sample OCing chip. :mad:
 
The CPU VID Special Add option is probably the Vcore. VTT is a different thing.
 
i got mine running stable at 500x8.5 with 1.3875 in bios which is closer to 1.36 in reality. I'm comfortable with running that many volts through my chip as my water loop keeps in safe temps. I suggest keep VTT on auto unless you know the proper ways of setting it, bump vcore/mch core and play around with voltage ppl. Leave the refrence voltages on auto. Mine went to 4ghz nearly on stock volts without raising mch much either.
 
That Linux Guy said:
Thank you SirMonkey and Zero for your responses.

I immediately ran into some confusion once I was in the BIOS. There are two similar sounding options in DFI's Genie BIOS. There's the CPU VID Special Add and the CPU VTT Voltage. My system seemed working just fine at stock voltage at 400fsb, but it would fail Orthos in 4 seconds. After raising the CPU VTT voltage, I still got the same result. The CPU VID Special Add option gives me exponential increments of 12.5mV. I raised this up two increments. I can't remember what the second number was, but my current voltage is 1.216 according to CPUz. When the CPU VID Special Add was only raised one increment, Orthos failed after 36 seconds. I guess I don't have a golden sample OCing chip. :mad:
Click to expand...

you can bump up your vtt a lot higher than that.
 
vanilla_guerilla said:
you can bump up your vtt a lot higher than that.
Click to expand...

Will it help? I've currently got my FSB at 410 and it's stable. CPU 3.69GHz @1.26v and RAM 984 MHz @ 2.2v. P35 chipset running at 1.5v. Anything above 410 FSB crashes in Orthos. I believe it's my RAM. Any ideas?
 
I looked for anything the was close to RAM deviders in my BIOS and couldn't find any. The closest thing I found only raised my RAM, rather than lower it. Don't remember the name of the option. It had settings such as 266/800, 266/1066, 266/1333, 333/800, 333/1066, 333/1333, etc. Any thoughts?
 
Any ideas on how to enable that in the DFI Genie BIOS? I've already gone through my BIOS twice, and the mainboard's manual several times.
 
Well, I'm not really familiar with DFI's BIOS notation. However, if I were to hazard a guess, I'd say that you should be looking for a divider where the right-hand side is double the value of the left-hand side, like 400/800 or 333/667.
 
to go above 3600 you will have to give your vcore a bump. i have a q6700 thats been running @ 1.46v vcore for 15 months. dont be afraid to give it a little juice.
 
@ Zero, thank you. You were right about the options. RAM/FSB ratio is now 1:1 and I have a lot more RAM headroom now. Thank you.

@ Vanilla gorilla, my voltage increments must be very small, because I've had to give it .2v extra to get 3.82 GHz to get it stable. I'm not afraid to give it some more juice. My Xigmatek CPU cooler keeps it under 48C at it's current speed full load. As long as it loads less than 60C, I'm good.
 
Always go a little at a time with voltage bumps. Then check for stability. A good thing about voltage bumps is that once your cpu gets used to running @ that voltage alot of times you can drop it down a little bit later and still receive the same results.
 
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